CN211579667U - Direct current charging power supply system - Google Patents

Direct current charging power supply system Download PDF

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Publication number
CN211579667U
CN211579667U CN202020344739.5U CN202020344739U CN211579667U CN 211579667 U CN211579667 U CN 211579667U CN 202020344739 U CN202020344739 U CN 202020344739U CN 211579667 U CN211579667 U CN 211579667U
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China
Prior art keywords
charging
module
output
direct current
power supply
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Active
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CN202020344739.5U
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Chinese (zh)
Inventor
杨又伦
曹剑
覃远福
刘建华
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Shenzhen Jiashengyu Technology Co ltd
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Shenzhen Jiashengyu Technology Co ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/12—Electric charging stations

Abstract

The utility model discloses a DC charging power supply system, which comprises a double-winding transformer module, an AC/DC rectifier module, a DC bus and a plurality of DC charging output modules connected in parallel on the DC bus, wherein the double-winding transformer module, the AC/DC rectifier module and the DC bus are connected in sequence; the AC/DC rectifier module is a 12-pulse rectifier, and an 11-order harmonic filter is further arranged between the input end of the double-winding transformer module and the alternating current input end. By configuring an 11-order harmonic filter, low-order harmonics generated by 12-order pulse rectification are suppressed, harmonics below 13-order harmonics can be filtered out, resonance is not easy to generate, and reliability and durability are higher; the secondary winding voltage of the double-winding transformer module is AC500V, the rectified voltage cannot exceed 520V-850V, and the input voltage range of the charging pile is met.

Description

Direct current charging power supply system
Technical Field
The utility model relates to the field of electronic technology, especially, relate to a direct current charging power supply system.
Background
At present, the reason for restricting the development of new energy automobiles is that besides the battery technology of new energy automobiles, the development of basic matched charging facilities is also an important factor for restricting the development of new energy automobiles. The number, the safety and the intelligent charging control level of the charging piles are more critical factors.
Charging piles in the current market are alternating current charging piles and direct current charging piles, and the alternating current charging piles are also called slow charging because of the slow charging speed; therefore, the direct current quick charging technology is vigorously developed, and the direct current charging pile is constructed to better accord with the current development trend. However, the power supply of the power supply system of the direct current charging pile is unstable, and the safety performance is not ideal.
In view of this, there is a need to provide a dc charging power supply system with safe performance, better expandability and low requirement for the capacity of the power grid.
SUMMERY OF THE UTILITY MODEL
The utility model provides a direct current charging power supply system to solve above-mentioned technical problem.
In order to achieve the above object, the present invention provides a DC charging power supply system, which comprises a double winding transformer module, an AC/DC rectifier module, a DC bus and a plurality of charging DC charging output modules connected in parallel to the DC bus, wherein the input end of the double winding transformer is connected to an AC input end for providing a commercial power supply, the secondary winding voltage of the double winding transformer module is AC500V, the output end of the double winding transformer module is connected to the input end of the AC/DC rectifier module, the AC/DC rectifier module is connected to the DC bus, and the charging DC charging output modules are connected to a charging pile;
the AC/DC rectifier module is a 12-pulse rectifier, and an 11-order harmonic filter is further arranged between the input end of the double-winding transformer module and the alternating current input end;
every the direct current that charges output module is including the input direct current fuse unit, surge suppressor unit, filter unit, soft starter unit, DCDC transformer unit, high frequency isolation transformer unit and the output terminal that connect gradually, wherein soft starter with the direct current fills the main control panel system connection of electric pile equipment.
Preferably, the system further comprises an energy storage battery and a photovoltaic power generation device which are connected in series on the direct current bus; the AC/DC rectifier module is a bidirectional inverter; the direct current charging pile equipment further comprises an energy management chip system connected with the bidirectional inverter, the charging direct current charging output modules, the energy storage battery and the photovoltaic power generation equipment.
Preferably, a direct current fuse is further connected in series between the high frequency isolation transformer unit and the output terminal.
Preferably, the number of the charging direct current charging output modules is 4, the rated output power of the charging pile is 30KW, and the direct current charging pile equipment is a 120KW system; or the number of the charging direct current charging output modules is 8, the rated output power of the charging pile is 30KW, and the direct current charging pile equipment is a 240KW system.
Preferably, the charging system further comprises an active watt-hour meter connected in parallel to the charging output module.
The direct-current charging power supply system comprises a double-winding transformer module, an AC/DC rectifier module, a direct-current bus and a plurality of direct-current charging output modules connected in parallel to the direct-current bus, wherein the double-winding transformer module, the AC/DC rectifier module and the direct-current charging output modules are sequentially connected, the input end of the double-winding transformer module is connected with an alternating-current input end used for providing a mains supply, the secondary winding voltage of the double-winding transformer module is AC500V, the output end of the double-winding transformer module is connected with the input end of the AC/DC rectifier module, the AC/DC rectifier module is connected into the direct-current bus, and the direct-current charging output modules are used for; the AC/DC rectifier module is a 12-pulse rectifier, and an 11-order harmonic filter is further arranged between the input end of the double-winding transformer and the alternating current input end; each direct current charging output module comprises an input direct current fuse unit, a surge suppressor unit, a filter unit, a soft starter unit, a DCDC transformer unit, a high-frequency isolation transformer unit and an output terminal which are sequentially connected, wherein the soft starter is connected with a main control panel system of the direct current charging pile equipment; the charging pile comprises a direct current input module and two charging circuit modules connected in parallel, and each charging circuit module comprises a direct current rectifying module, a charging output module and a charging gun which are sequentially connected in series; the charging output module comprises a contactor and a high-voltage fuse which are connected in series.
By configuring an 11-order harmonic filter, low-order harmonics generated by 12-order pulse rectification are suppressed, and harmonics below 13-order harmonics can be filtered out to ensure that the input harmonic current is less than 5%; compared with the traditional active PFC Vienna rectification scheme, the 12-pulse rectification method has the advantages of better adaptability to the power grid, difficulty in generating resonance, higher reliability and higher durability. The voltage of the secondary winding of the transformer is AC500V, and the rectified voltage does not exceed 520V-850V in consideration of the +/-20% fluctuation of the power grid voltage and 10% fluctuation caused by load change, so that the input voltage range of the charging pile is met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic diagram of a module structure of a dc charging pile device according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a circuit module of a dc charging pile device according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a circuit connection relationship between a dual-winding transformer module and an AC/DC rectifier module of the DC charging pile device according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a dc charging output module of a dc charging power supply system according to an embodiment of the present invention;
fig. 5 is a schematic circuit block diagram of a dc charging power supply system according to an embodiment of the present invention;
fig. 6 is a schematic circuit diagram of a dc charging power supply system according to an embodiment of the present invention.
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1, the utility model provides a direct current fills electric pile equipment 1, including main control panel system 201, direct current charging source system 202 and a plurality of electric pile 203 that fills.
Referring to fig. 1 to 4, the DC charging power supply system 202 includes a dual-winding transformer module 210, an AC/DC rectifier module 220, a DC bus (not shown), and a plurality of DC charging output modules 240 connected in parallel to the DC bus. The input end of the double-winding transformer 210 is connected to an AC input end (not shown) for providing a commercial power source, the secondary winding voltage of the double-winding transformer module 210 is AC500V, the output end of the double-winding transformer module 210 is connected to the input end of the AC/DC rectifier module 220, the AC/DC rectifier module 220 is connected to the DC bus, and the DC charging output module 240 is used for being connected to the charging pile 203.
The AC/DC rectifier module 220 is a 12-pulse rectifier, and an 11-th harmonic filter 11 is further disposed between the input end of the double-winding transformer module 10 and the AC input end;
each of the dc charging output modules 240 includes an input dc fuse unit 401, a surge suppressor unit 402, a filter unit 403, a soft starter unit 404, a DCDC transformer unit 405, a high-frequency isolation transformer unit 406, and an output terminal (not shown) connected in sequence, where the soft starter 404 is connected to the main control board system 101 of the dc charging pile device 100. The filter unit 403 can suppress harmful oscillation between the power supply and the dc bus, so as to ensure stable power supply of the system, and the occurrence of short circuit and other faults inside a single module will not affect the normal operation of the system.
The charging pile 203 comprises a direct current input module 281 and two charging circuit modules 282 connected in parallel, wherein each charging circuit module 282 comprises a direct current rectifying module 821, a charging output module 822 and a charging gun 823 which are sequentially connected in series; the charging output module 822 includes a contactor 290 and a high voltage fuse 291 connected in series.
The direct current charging pile equipment 1 in the embodiment is provided with an 11-order harmonic filter, so that low-order harmonics generated by 12-order pulse rectification are suppressed, and harmonics below 13-order harmonics can be filtered out, so that the input harmonic current is ensured to be less than 5%; compared with the traditional active PFC Vienna rectification scheme, the 12-pulse rectification method has the advantages of better adaptability to the power grid, difficulty in generating resonance, higher reliability and higher durability. The voltage of the secondary winding of the transformer is AC500V, and the rectified voltage does not exceed 520V-850V in consideration of the +/-20% fluctuation of the power grid voltage and 10% fluctuation caused by load change, so that the input voltage range of the charging pile is met.
Preferably, in a preferred embodiment, the dc charging pile device 1 further includes an energy storage battery 204 and a photovoltaic power generation device 205 connected in series on the dc bus; the AC/DC rectifier module 220 is a bi-directional inverter; the dc charging pile device 1 further includes an energy management chip system 206 connected to the bidirectional inverter, the plurality of dc charging output modules 240, the energy storage battery 204, and the photovoltaic power generation device 205. If the direct current charging pile equipment 1 is configured with components such as an energy storage battery, photovoltaic power generation and a bidirectional inverter, an Energy Management System (EMS) is needed to be configured at the moment due to functional requirements such as energy scheduling management, peak clipping and valley filling, charge and discharge control and photovoltaic power generation, so that units such as a power grid, a charging pile, the energy storage battery and the photovoltaic power generation are scheduled and managed.
Preferably, in a preferred embodiment, a dc fuse is further connected in series between the high-frequency isolation transformer unit and the output terminal.
Preferably, in a preferred embodiment, the number of the dc charging output modules 40 is 4, the rated output power of the charging pile is 30KW, and the dc charging pile equipment is a 120KW system; or the number of the direct current charging output modules is 8, the rated output power of the charging pile is 30KW, and the direct current charging pile equipment is a 240KW system. In addition, at most 32 direct current charging output modules 40 can be connected in parallel to form a 1MW system, and those skilled in the art can set the system as required. The whole system scheme belongs to an intelligent flexible power supply system, has good expandability, can reduce the requirement on the capacity of a power grid, and has good economic benefits.
Preferably, in a preferred embodiment, the dc rectifier module 821 is also connected to the main control board system 201.
Preferably, in a preferred embodiment, the charging system further comprises an active watt-hour meter connected in parallel to the charging output module 240.
Preferably, in a preferred embodiment, the dc rectifying module 821 includes a plurality of parallel dc rectifying circuit units and a bus, a dc input end of each of the dc rectifying circuit units is connected to the output terminal of the dc charging output module, and output ends of the parallel dc rectifying circuit units are connected via the bus.
Referring to fig. 5 and 6, the charging pile 203 of the present invention is a dc dual-gun charging integrated machine, which includes a casing (not shown), two charging guns (not shown), and a DCDC charging power supply system 100 disposed in the casing and connected to the two charging guns. The DCDC charging power supply system 100 comprises a direct current input module 10, a direct current D-level lightning protection module 40, two charging circuit modules 20 connected in parallel and a single-double gun switching contactor module; each of the charging circuit modules 20 includes a rectifying module 30, a charging output module 50, an auxiliary power supply output module 60, and an output terminal 70.
Wherein the dc input module 10 includes a positive input line and a negative input line, and the dc input module 10 is electrically connected to the output terminal of the dc charging output module 240;
the input line of the surge lightning arrester 41 of the dc class D lightning protection module 40 is connected to the positive input line and the negative input line, and the PE line of the surge lightning arrester 41 is connected to the PE end of the cabinet (not shown) of the dc twin-gun charger;
the charging circuit module 20 is connected in parallel with the dc class D lightning protection module 40.
The rectification module 30 includes a plurality of parallel first dc rectification circuit units 31(DCDC1, DCDC2, DCDC3, DCDC4, DCDC5, and DCDC6), and a bus bar (not shown), wherein a dc input end of each first dc rectification circuit unit 31 is connected to the positive input line and the negative input line, and output ends of the plurality of parallel first dc rectification circuit units 31 are connected via the bus bar.
The output terminals 70 include charging output terminals (DC + and DC-) and auxiliary power supply output terminals (S + and S-).
The charging output module 50 is connected between the output of the bus bar and the charging output terminals (DC + and DC-), the charging output module 50 including a high voltage fuse 51 connected between the output of the bus bar and the charging output terminals (DC + and DC-);
the auxiliary power supply output module 60 includes a second dc rectifier circuit unit 61, an input end of the second dc rectifier circuit unit 61 is connected to the positive input line and the negative input line in parallel, and an output end of the second dc rectifier circuit unit 61 is connected to the auxiliary power supply output terminals (S + and S-);
the single-double gun switching contactor module includes a positive contactor K7 connected between positive terminals of output terminals of the rectifier modules 30 of the two parallel charging circuit modules 20, and a negative contactor K8 connected between negative terminals of output terminals of the rectifier modules 30 of the two parallel charging circuit modules 20.
The direct-current double-gun simultaneous charging all-in-one machine in the embodiment is powered by a direct-current power supply, and a direct-current D-level lightning protection device breaker is connected in parallel with a rectifier and provides 20KA (maximum leakage current 40KA) rated direct-current lightning protection; the maximum output power of the integrated machine is 160KW, and the adjustable voltage of 0-1000Vdc is output; the two charging circuit modules 20 can work independently with double guns or with single gun, and when the positive and negative contactors K7 and K8 are disconnected, the A, B two groups of modules can independently supply power to the gun a and the gun B; when the positive and negative contactors K7 and K8 are closed, the system can supply power to one of the A gun and the B gun at full power (only one gun can work at the time).
Preferably, in a preferred embodiment, the charging output module 50 further includes a first contactor 52(K3, K4, K5, K6), and the first contactor 52 is connected in series with the high-voltage fuse 51, for example, the first contactor 52 is connected between the positive terminal DC + of the charging output terminal and the high-voltage fuse 51, or the first contactor 52 is connected between the output terminal of the bus bar of the rectifying module 30 and the high-voltage fuse 51.
Preferably, in a preferred embodiment, the dc rectifier circuit unit 31 includes 2 high-efficiency rectifier circuit units and at least one common high-efficiency rectifier circuit unit. For example, 2 high-efficiency rectifier circuit units are adopted, the parallel connection mode is adopted for work, the direct current output of the rectifier module 30 is connected in a junction mode through a busbar, passes through a high-voltage direct current contactor 52, is protected by a high-voltage fuse 51, and is connected to the output of a charging gun through the charging output terminals (DC + and DC-); the maximum output power of the integrated machine is 160KW, and the adjustable voltage of 0-1000Vdc is output.
Preferably, in a preferred embodiment, the auxiliary power output module 60 further includes a secondary lightning protection module (not shown) and a second contactor 62, wherein the second contactor 62 is connected between the positive terminal S + of the auxiliary power output terminal and the positive terminal of the output terminal of the second dc rectification circuit unit 62.
Preferably, in a preferred embodiment, the auxiliary power output module 60 further includes at least one third dc rectifying circuit unit 63, and an input end of the third dc rectifying circuit unit 63 is connected to the positive input line and the negative input line in parallel; the output voltage of the output terminal of the third dc rectifying circuit unit 63 may be a supply voltage of a fan, a supply voltage of an audio device, or the like. It is understood that in other embodiments, the number of the third dc rectification circuit units 63 may be more to meet other power output requirements.
Preferably, in a preferred embodiment, the output terminal 70 further includes a communication terminal.
Preferably, in a preferred embodiment, the charging system further comprises an active watt-hour meter 53 connected in parallel to the charging output module 50.
Preferably, in a preferred embodiment, a load switch 90 and a high voltage fuse 91 are further disposed between the dc input module 10 and the two parallel charging circuit modules 20.
The above is only the preferred embodiment of the present invention, and not the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings or the direct or indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims (5)

1. A DC charging power supply system comprises a double-winding transformer module, an AC/DC rectifier module, a DC bus and a plurality of charging DC charging output modules connected in parallel on the DC bus in sequence, wherein the input end of the double-winding transformer is connected with an AC input end for providing a commercial power supply,
the secondary winding voltage of the double-winding transformer module is AC500V, the output end of the double-winding transformer module is connected with the input end of the AC/DC rectifier module, the AC/DC rectifier module is connected to the DC bus, and the charging DC charging output module is used for being connected with a charging pile;
the AC/DC rectifier module is a 12-pulse rectifier, and an 11-order harmonic filter is further arranged between the input end of the double-winding transformer module and the alternating current input end;
every the direct current that charges output module is including the input direct current fuse unit, surge suppressor unit, filter unit, soft starter unit, DCDC transformer unit, high frequency isolation transformer unit and the output terminal that connect gradually, wherein soft starter with the direct current fills the main control panel system connection of electric pile equipment.
2. The dc charging power supply system according to claim 1, further comprising an energy storage battery and a photovoltaic power generation device connected in series on the dc bus; the AC/DC rectifier module is a bidirectional inverter; the direct current charging pile equipment further comprises an energy management chip system connected with the bidirectional inverter, the plurality of direct current charging output modules, the energy storage battery and the photovoltaic power generation equipment.
3. The dc charging power supply system according to claim 1, wherein a dc fuse is further connected in series between the high-frequency isolation transformer unit and the output terminal.
4. The direct-current charging power supply system according to claim 1, wherein the number of the direct-current charging output modules is 4, the rated output power of the charging pile is 30KW, and the direct-current charging pile equipment is a 120KW system; or the number of the direct current charging output modules is 8, the rated output power of the charging pile is 30KW, and the direct current charging pile equipment is a 240KW system.
5. The dc charging power supply system according to claim 1, further comprising an active watt-hour meter connected in parallel to the charging output module.
CN202020344739.5U 2020-03-18 2020-03-18 Direct current charging power supply system Active CN211579667U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111251930A (en) * 2020-03-18 2020-06-09 深圳市佳晟宇科技有限公司 Direct current fills electric pile equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111251930A (en) * 2020-03-18 2020-06-09 深圳市佳晟宇科技有限公司 Direct current fills electric pile equipment

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